Help identifying old crank

A quick learner says:
June 13, 2013
Hi, my house was built in 1956 with lots of awning type windows, being pre-AC Florida.

There is no branding on any of the parts. The bolt to bolt distance is 3.840 inches, as measured with a dial caliper. I am attaching several pictures.

These have been a bane to the family for over 50 years! I hope you can supply us with new ones.

Paul
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
June 13, 2013
Thank you for posting. Could I see a few pictures of this operator removed from the window? That will help us identify what you need. Can you also tell me the distance between its screw holes, center-to-center?
A quick learner says:
June 13, 2013
Screw hole, center to center is the same as bolt head, center to center. I measured it three times, since 840/1000 inch doesn't match any fractional size.

I rather not pull an operator out unless absolutely necessary, they are old, and, um, "cranky." Fragile.

May I suggest seeing what you have that matches the hole center dimension and see if anything pops up. I might be able to use non-awning, regular casement gear boxes if that's all that's available. I'm a good pseudo-engineer.
Profile picture of Tom
Tom from SWISCO responded:
June 19, 2013
Thank you for your patience in this matter. Unfortunately, I have not been able to find anything that matches those dimensions and that style. The closest I could find is our 39-182, however I am not sure if the arm will work for you. Without seeing it removed, I cannot find a better match.
POW Awning Operator
POW Awning Operator
39-182
$23.70
How to identify casement and awning operators
How to identify casement and awning operators
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.